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Spectroscopic characterization of HD 95086 b with the Gemini Planet Imager.

De Rosa, Robert J. and Rameau, Julien and Patience, Jenny and Graham, James R. and Doyon, René and Lafrenière, David and Macintosh, Bruce and Pueyo, Laurent and Rajan, Abhijith and Wang, Jason J. and Ward-Duong, Kimberly and Hung, Li-Wei and Maire, Jérôme and Nielsen, Eric L. and Ammons, S. Mark and Bulger, Joanna and Cardwell, Andrew and Chilcote, Jeffrey K. and Galvez, Ramon L. and Gerard, Benjamin L. and Goodsell, Stephen and Hartung, Markus and Hibon, Pascale and Ingraham, Patrick and Johnson-Groh, Mara and Kalas, Paul and Konopacky, Quinn M. and Marchis, Franck and Marois, Christian and Metchev, Stanimir and Morzinski, Katie M. and Oppenheimer, Rebecca and Perrin, Marshall D. and Rantakyrö, Fredrik T. and Savransky, Dmitry and Thomas, Sandrine (2016) 'Spectroscopic characterization of HD 95086 b with the Gemini Planet Imager.', Astrophysical journal., 824 (2). pp. 121-138.

Abstract

We present new H (1.5-1.8 μm) photometric and K1 (1.9-2.2 μm) spectroscopic observations of the young exoplanet HD 95086 b obtained with the Gemini Planet Imager. The H-band magnitude has been significantly improved relative to previous measurements, whereas the low resolution K1 (λ/δλ≈66) spectrum is featureless within the measurement uncertainties, and presents a monotonically increasing pseudo-continuum consistent with a cloudy atmosphere. By combining these new measurements with literature L′ photometry, we compare the spectral energy distribution of the planet to other young planetary-mass companions, field brown dwarfs, and to the predictions of grids of model atmospheres. HD 95086 b is over a magnitude redder in K1−L′ color than 2MASS J12073346-3932539 b and HR 8799 c and d, despite having a similar L′ magnitude. Considering only the near-infrared measurements, HD 95086 b is most analogous to the brown dwarfs 2MASS J2244316+204343 and 2MASS J21481633+4003594, both of which are thought to have dusty atmospheres. Morphologically, the spectral energy distribution of HD 95086 b is best fit by low temperature (Teff= 800-1300 K), low surface gravity spectra from models which simulate high photospheric dust content. This range of effective temperatures is consistent with field L/T transition objects, but the spectral type of HD 95086 b is poorly constrained between early L and late T due to its unusual position the color-magnitude diagram, demonstrating the difficulty in spectral typing young, low surface gravity substellar objects. As one of the reddest such objects, HD 95086 b represents an important empirical benchmark against which our current understanding of the atmospheric properties of young extrasolar planets can be tested.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.3847/0004-637X/824/2/121
Publisher statement:© 2016. The American Astronomical Society. All rights reserved.
Date accepted:05 April 2016
Date deposited:26 January 2017
Date of first online publication:21 June 2016
Date first made open access:26 January 2017

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